Q392 - Navigation General: Rivers, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. Which would influence a magnetic compass?Not learned 2. A towboat has the same draft as the barges it is pushing ahead. If the distance from the stern of the towboat to the head of the tow is 800 feet, where is the approximate location of the pivot point of the unit?Not learned 3. What does the abbreviation L.W.R.P. on the navigation maps mean?Not learned 4. What is an advantage of the magnetic compass aboard vessels?Not learned 5. Which agency maintains federal aids to navigation?Not learned 6. Which agency publishes the Light Lists?Not learned 7. An air mass that has moved down from Canada would most likely have which symbols?Not learned 8. When is an air mass termed "warm"?Not learned 9. Which is a characteristic of anticyclones?Not learned 10. What should you apply to a fathometer reading to determine the depth of water?Not learned 11. You are approaching a drawbridge and must pass through during a scheduled closure period. What signal should you sound?Not learned 12. You are approaching the first of two drawbridges that span a narrow channel. The second drawbridge is close to the first. Which signals should you sound?Not learned 13. You are approaching a lock and see a flashing amber light located on the lock wall. Which action should you take?Not learned 14. You are approaching a multiple-span bridge at night. How is the main navigational channel span indicated?Not learned 15. You are approaching an open drawbridge and sound the proper signal. You receive no acknowledgment from the bridge. Which action should you take?Not learned 16. You are approaching a vertical lift bridge. How do you know when the span is fully open?Not learned 17. Which is an area of strong westerly winds occurring between 40°S and 60°S latitude?Not learned 18. Ascending and descending air masses with different temperatures is part of an important heat transmitting process in our atmosphere. Which term is given to this process?Not learned 19. You are ascending a river and exchanging navigational information via radiotelephone with a descending vessel. If the descending vessel advises you to "watch for the set" above point X, what would you expect to encounter above point X?Not learned 20. A backlash below a lock is defined as __________.Not learned 21. What is the basic principle of the magnetic compass?Not learned 22. A bridge over a navigable waterway is being repaired. There is a traveler platform under the bridge's deck that significantly reduces the vertical clearance. If required by the CG district commander, how will this be indicated at night?Not learned 23. Brief, violent showers frequently accompanied by thunder and lightning are usually associated with __________.Not learned 24. What does a buoy with a composite group-flashing light indicate?Not learned 25. Which of the buoys listed below could be used to mark an anchorage?Not learned 26. How are buoys which mark isolated dangers painted?Not learned 27. Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic?Not learned 28. Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE?Not learned 29. Which buoy may be odd numbered?Not learned 30. When a buoy is in position only during a certain period of the year, where may the dates when the buoy is in position be found?Not learned 31. A buoy having red and green horizontal bands would have which light characteristic?Not learned 32. The channel under a bridge is marked with lights of the lateral system. The centerline of the channel shall be marked on the bridge in which manner?Not learned 33. You are in a channel inbound from sea. A daymark used to mark a channel junction when the preferred channel is to starboard will have the shape indicated by what letter in illustration D045NG below?Not learned 34. Which characteristic and color will a preferred-channel buoy show?Not learned 35. Which is a characteristic of a port side daymark?Not learned 36. A chart has extensive corrections to be made to it. When these are made and the chart is again printed, what term is given to this chart issue?Not learned 37. The chart indicates the variation was 3°45'W in 1988, and the annual change is decreasing 6'. If you use the chart in 1991 how much variation should you apply?Not learned 38. What do chart legends printed in capital letters indicate about the associated landmark?Not learned 39. When cold air displaces warm air, you have which type of front?Not learned 40. What color lights do lighted information markers display?Not learned 41. What is the color scheme of navigational marks used for informational or regulatory purposes?Not learned 42. What color is a triangular daymark?Not learned 43. When compared to air temperature, which factor is most useful in predicting fog?Not learned 44. Which condition(s) is(are) necessary for the formation of dew?Not learned 45. Who should be consulted for changing conditions of controlling depths in major channels?Not learned 46. Which defines the controlling depth of the river?Not learned 47. By convention, the Earth's south magnetic pole is which color?Not learned 48. Cumulonimbus clouds are formed by __________.Not learned 49. A current moving across a lock entrance toward the river or toward the dam is known by which term?Not learned 50. Which daymark has no lateral significance?Not learned 51. What daymark shape is used in the lateral system?Not learned 52. A daymark used as a special mark is indicated by which letter in illustration D045NG below?Not learned 53. Which describes a deadhead?Not learned 54. Which defines a bold reef?Not learned 55. Which is TRUE concerning privately maintained aids to navigation included in the Light List?Not learned 56. What does the description "Racon" beside an illustration on a chart mean?Not learned 57. Deviation is the angle between the __________.Not learned 58. Which is TRUE concerning the dew point temperature?Not learned 59. How are the doldrums characterized?Not learned 60. What does a Doppler log in the bottom return mode indicate?Not learned 61. When does a Doppler speed log indicate speed over ground?Not learned 62. The dry bulb temperature is 73°F (22.8°C) and the wet bulb temperature is 60°F (15.6°C). What is the relative humidity?Not learned 63. When a dual-purpose marking is used, how should the mariner following the Intracoastal Waterway be guided?Not learned 64. An electronic depth finder operates on which principle?Not learned 65. You are enroute to Sioux City, Iowa on the Missouri River. When would you most likely encounter a frontal thunderstorm?Not learned 66. You are entering an east coast port and see a buoy with a yellow triangle painted on it. What does the symbol indicate?Not learned 67. In IALA Region B, entering from sea, how would a daymark on the port side of the channel be indicated on a chart?Not learned 68. When entering from seaward, what does a buoy displaying a composite group (2+1) flashing red light indicate?Not learned 69. What can be expected with the presence of stratus clouds and a dying wind?Not learned 70. What does the expression "the air is saturated" mean?Not learned 71. What feature(s) of a daymark is (are) used to identify the beacon upon which it is mounted?Not learned 72. Which is a feature of a special daymark?Not learned 73. To find the specific phase characteristic of a lighthouse on a sound of the United States you would use which reference?Not learned 74. Fog forms when the air temperature is at or below __________.Not learned 75. Which fog is produced by warm moist air passing over a cold surface?Not learned 76. The following boats are approaching a lock. Which has priority for locking?Not learned 77. Which of the following describes the principal purpose of magnetic compass adjustment?Not learned 78. Which of the following is a standard correction applied to the reading of an aneroid barometer?Not learned 79. The following types of vessels are awaiting lockage on the upper Mississippi. Which type of vessel is normally passed through the lock first?Not learned 80. Which government agency publishes the U.S. Coast Pilot?Not learned 81. A green buoy has a yellow triangle on it. What type of buoy is this?Not learned 82. Red lights may appear on which buoys?Not learned 83. The height of a light is measured from which reference plane?Not learned 84. As a high-pressure system approaches, which is TRUE concerning the barometer reading?Not learned 85. What is the term used for the horizontal angle between the magnetic meridian and the north-south line axis line of the magnetic compass?Not learned 86. What does a hygrometer measure?Not learned 87. Under the IALA-B Buoyage System, when entering from seaward, a buoy that should be left to port will be which color?Not learned 88. Under the IALA-B Buoyage System, when entering from seaward a lateral system buoy to be left to starboard may display which of the topmarks shown in illustration D046NG below?Not learned 89. In the IALA Buoyage System, what do buoys with alternating red and green horizontal bands indicate?Not learned 90. Under the U.S. Aids to Navigation System, what does a lighted buoy with a spherical topmark mark indicate?Not learned 91. Under the IALA Buoyage System, which topmark shown in illustration D023NG below will be displayed on a safe watermark?Not learned 92. In the IALA Maritime Buoyage System, what is a red and white vertically-striped buoy used to indicate?Not learned 93. Illustration D037NG below represents a movable dam. If there is high water and the wickets are down so that there is an unobstructed navigable pass through the dam, what light(s) will be shown at D if the lock walls and piers are not awash?Not learned 94. In illustration D039NG below, what type of cloud is indicated by the number one?Not learned 95. In illustration D045NG below, which shape is a daymark warning of danger?Not learned 96. In illustration D045NG below, what two shapes shown are used to indicate a preferred channel?Not learned 97. Which indication on the barometer is most meaningful in forecasting weather?Not learned 98. What will NOT induce errors into a Doppler sonar log?Not learned 99. You have been informed that dredging operations may be underway in your vicinity. Which buoy indicates the dredging area?Not learned 100. Which instrument is used to measure the relative humidity of the air?Not learned 101. On an isomagnetic chart, which term is used for the line of zero variation?Not learned 102. Which item in illustration D034NG below shows a flashing light?Not learned 103. A large automated navigational buoy, such as those that have replaced some lightships, would be shown on a chart by which symbol in illustration D015NG below?Not learned 104. Which is TRUE of a lateral system buoy displaying a quick flashing light?Not learned 105. In which situation is the light characteristic of composite group flashing (2 + 1) used in the Aids to Navigation System on the Western Rivers?Not learned 106. The light characteristic of flashing is used in the Aids to Navigation System on the Western Rivers. Which example is required to utilize this characteristic?Not learned 107. Which light characteristic may be used on a special purpose mark?Not learned 108. Which term describes a light, feathery deposit of ice by sublimation of water vapor directly into the crystalline form on objects whose temperatures are below freezing?Not learned 109. The Light List indicates that a light has a nominal range of 10 miles and is 11 feet high. If the visibility is 15 miles and your height of eye is 20 feet, at what approximate distance will you sight the light?Not learned 110. The Light List shows a lighted aid to navigation on the right bank. In which situation can the light be seen on the port side of a vessel?Not learned 111. The Light List shows that a navigational light has a nominal range of 12 miles and a height above water of 25 feet (7.6 meters). Your height of eye is 38 feet (11.6 meters) and the visibility is 5.5 miles. At what approximate range will you FIRST sight the light?Not learned 112. The Light List shows that a navigational light has a nominal range of 6 miles and a height above water of 18 feet (5.5 meters). Your height of eye is 47 feet (14.3 meters) and the visibility is 1.5 miles. At what approximate range will you first sight the light?Not learned 113. What is the light phase characteristic of a lighted isolated-danger mark?Not learned 114. Which would you expect to see on a lighted preferred-channel buoy?Not learned 115. Lighted white and orange buoys must show which color light?Not learned 116. Which list of clouds is in sequence, from highest to lowest in the sky?Not learned 117. At which location is the value of sixty nautical miles per degree of geodetic latitude most correct?Not learned 118. Which is TRUE concerning magnetic compass deviation?Not learned 119. Which is the main factor that causes the deflection of the southeast trade winds?Not learned 120. In many areas "atoll" clouds (clouds of vertical development) are produced over small islands. What causes the development of these clouds?Not learned 121. What is the reference datum mean high water used to measure?Not learned 122. Which measurement uses mean high water as the reference plane?Not learned 123. Mean lower low water is the reference plane used for which measurements?Not learned 124. A mid-channel buoy, may show which light?Not learned 125. The National Oceanic and Atmospheric Administration publishes which item?Not learned 126. On a nautical chart, what does the inner ring of a compass rose indicate?Not learned 127. How is a navigation light identified on an Army Corps of Engineers navigation map?Not learned 128. On navigational aids, what does the light characteristic "Fl(2+1)" mean?Not learned 129. In the Northern Hemisphere, when the center of a high-pressure system is due east of your position, you can expect winds from which direction?Not learned 130. In the Northern Hemisphere, an observer at point II in illustration D014NG below, should experience a wind shift from what direction?Not learned 131. If an observer in the Northern Hemisphere faces the surface wind, where is the center of low pressure located?Not learned 132. When observing a rapid rise in barometric pressure, what may you expect?Not learned 133. How is an occluded front represented on a weather map?Not learned 134. When operated over a muddy bottom, a fathometer may indicate which of the following?Not learned 135. You are operating on the Illinois River. Which time of day would Heat thunderstorms most likely develop?Not learned 136. You are operating on the Red River Waterway, a warm front has passed and your vessel is in the warm sector. What wind conditions would you expect at your vessel?Not learned 137. On what does the operation of an aneroid barometer depend?Not learned 138. An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol?Not learned 139. An orange and white buoy with a rectangle on it displays what information?Not learned 140. While passing through Memphis, the weather report on the TV news indicates that a cold front is crossing western Kentucky and Tennessee. Tomorrow's weather will be dominated by a high-pressure area. What weather should you expect tomorrow?Not learned 141. All persons or vessels within the lock area, including the lock approach channels, come under the authority of which person?Not learned 142. Which publication should you check for complete information on Puget Sound weather conditions?Not learned 143. Which publication contains information on navigation regulations, landmarks, channels, anchorages, tides, currents, and clearances of bridges for Chesapeake Bay?Not learned 144. Which publication lists Class I and II private aids to navigation in or along navigable waters of the United States?Not learned 145. What is published by the U.S. Coast Guard?Not learned 146. You are pushing a tow ahead and passing close to another towboat which is pushing ahead in the same direction (you are overtaking). After the towheads pass close alongside __________.Not learned 147. When recording the wind direction in the weather log, which information would you report?Not learned 148. Which is the reference datum used in determining the heights of land features on most charts?Not learned 149. Relative humidity is the percentage of water vapor that is in the air as compared to the maximum amount it can hold at __________.Not learned 150. Safe water buoys may show ONLY which type of light?Not learned 151. A safe water daymark has what shape?Not learned 152. How is a safe water mark, that can be passed close aboard on either side, painted and lighted?Not learned 153. You are sailing south on the Intracoastal Waterway (ICW) when you sight a red nun buoy with a yellow square painted on it. Which of the following is TRUE?Not learned 154. You are sailing south on the Intracoastal Waterway (ICW) when you sight a red nun buoy with a yellow triangle painted on it. Which statement is TRUE?Not learned 155. A section of the river that is narrower than usual and is often navigable from bank to bank is a __________.Not learned 156. What does the shoreline on charts generally represent?Not learned 157. You sight a buoy fitted with a double-sphere topmark. If sighted at night, what color and light sequence would you expect to see?Not learned 158. What is a sling psychrometer used to measure?Not learned 159. What does a slow, gradual fall of the barometer indicate?Not learned 160. What does a slow rise in the barometric pressure forecast?Not learned 161. Sometimes foreign charts are reproduced by NGA. On such a chart a wire dragged (swept) area may be shown in purple or which other color?Not learned 162. In which source could you find the vertical clearance of a bridge on the Ohio River?Not learned 163. Squall lines with an almost unbroken line of threatening dark clouds and sharp changes in wind direction, generally precede which front?Not learned 164. What is the standard atmospheric pressure in millibars?Not learned 165. Steam fog is most likely to occur on the Mississippi and Ohio Rivers in __________.Not learned 166. You are steaming southward along the west coast of the United States when you encounter a buoy showing a flashing red light. Which is TRUE concerning the buoy?Not learned 167. You are steaming southward along the west coast of the United States when you sight a buoy showing a flashing green light. How should you pass this buoy?Not learned 168. Which term is used to describe a structure, usually made of stone, or cement pilings, which extends from the bank at approximately right angles to the current?Not learned 169. The symbol which appears beside a light on a chart reads "Gp Fl R (2) 10 sec 160 ft 19M". Which characteristic describes the light?Not learned 170. Which table is NOT found in the U.S. Coast Pilots?Not learned 171. Which is TRUE as the temperature for a given mass of air increases?Not learned 172. Which term defines a submerged dike extending from the bank of the river used to train the channel?Not learned 173. Which term describes a tow that is properly aligned to pass through a narrow opening between two bridge piers or any other critical navigational maneuver?Not learned 174. Which term is given to the vertical angle between the horizontal and the magnetic line of force?Not learned 175. Which term is used to describe a generally circular low-pressure area?Not learned 176. Which topmark shown in illustration D023NG below identifies an isolated danger?Not learned 177. Which is TRUE of a bluff bar?Not learned 178. Which is TRUE if the compass error of a magnetic compass has no deviation?Not learned 179. Which is TRUE concerning the flow of air around an anticyclone in the Southern Hemisphere?Not learned 180. Which is TRUE concerning Hot air?Not learned 181. What is TRUE concerning new editions of Light Lists?Not learned 182. Which is TRUE concerning the points on the earth's surface where the magnetic dip is 90°?Not learned 183. Which is TRUE of the direction of flow (channel) on the Corps of Engineer's Navigation Maps?Not learned 184. Which is TRUE of a vertically-striped buoy?Not learned 185. What type of clouds are associated with a cold front?Not learned 186. Which type of daymark is used to mark the starboard side of the channel when entering from sea?Not learned 187. Which type of fog occurs on clear nights with very light breezes and forms when the earth cools rapidly?Not learned 188. Which type of precipitation occurs only in thunderstorms with strong convection currents that convey raindrops above and below the freezing level?Not learned 189. Which type of weather could you expect soon after seeing "hook" or "comma" shaped cirrus clouds?Not learned 190. What is typical of warm front weather conditions?Not learned 191. Under the U.S. Aids to Navigation System, which category is a yellow buoy?Not learned 192. In the U.S. Aids to Navigation System, lateral aids as seen entering from seaward will display lights with which characteristic?Not learned 193. In the U.S. Aids to Navigation System, what do red and green horizontally-banded buoys mark?Not learned 194. Under the U.S. Aids to Navigation System used on the Western Rivers, which is TRUE of the aids to navigation lights on the right descending bank?Not learned 195. Under the U.S. Aids to Navigation System on the Western Rivers, what color are the buoys marking the starboard side of the channel when going upstream?Not learned 196. Under the U.S. Aids to Navigation System on the Western Rivers, which describes the daymarks on the right descending bank?Not learned 197. Under the U.S. Aids to Navigation System on the Western Rivers, which is TRUE of a preferred channel buoy?Not learned 198. In the U.S. Aids to Navigation System on the Western Rivers, a preferred channel buoy to be left to port while proceeding downstream will __________.Not learned 199. Under the U.S. Aids to Navigation System on the Western Rivers, which is TRUE of a daymark on the right descending bank?Not learned 200. You are underway and pass by a lighthouse. Its light, which was white since you first sighted it, changes to red. What does this indicate?Not learned 201. In United States waters, a buoy having red and white vertical stripes if lighted, it will have which light characteristic?Not learned 202. While upbound through Memphis, the weather report on the TV news indicates that a cold front will cross western Kentucky and Tennessee the next morning. What weather should accompany this front?Not learned 203. While upbound through Memphis, the weather report on TV news indicates that a warm front is stationary over Kentucky - Missouri - Tennessee areas. What weather conditions should you expect?Not learned 204. When using a recording depth finder in the open ocean, what phenomena is most likely to produce a continuous trace that may not be from the actual ocean bottom?Not learned 205. Your vessel is located at position I on the weather map in illustration D013NG below. You should experience which weather condition?Not learned 206. As your vessel is heading southward along the east coast of the United States, you encounter a buoy showing a red flashing light. How should you pass this buoy?Not learned 207. If your vessel must pass through a draw bridge during a scheduled closure period, what signal should you sound to request the opening of the draw?Not learned 208. If your vessel were proceeding upriver (ascending), how is the port side of the channel marked according to the U. S. Aids to Navigation System on the Western Rivers?Not learned 209. When a warm air mass overtakes a cold air mass, which term is given to the contact surface?Not learned 210. While on watch, you notice that the air temperature is dropping and is approaching the dew point. Which type of weather should be forecasted?Not learned 211. What weather change accompanies the passage of a cold front in the Northern Hemisphere?Not learned 212. A weather forecast states that the wind will commence veering. In the Northern Hemisphere, what changes will occur?Not learned 213. What does a white buoy with a blue band signify?Not learned 214. What does a white buoy with an open-faced orange diamond on it indicate?Not learned 215. What does a white buoy with an orange rectangle on it indicate?Not learned 216. White lights may be found on which buoys?Not learned 217. On a working copy of a weather map what color is the line that represents a warm front?Not learned 218. Yellow lights may appear on which buoys?Not learned 219. Under the IALA-A Buoyage System, when entering from seaward a lateral system buoy to be left to port may display which topmark shown in illustration D046NG below?Not learned 220. On a working copy of a weather map what color is the line that represents a stationary front?Not learned 221. You are in a channel inbound from sea. A daymark used to mark a channel junction, when the preferred channel is to port will have the shape indicated by what letter in illustration D045NG below?Not learned 222. How are cumulonimbus clouds formed?Not learned 223. Which item in illustration D034NG below shows a fixed and flashing light?Not learned 224. How is an occluded front represented on a weather map?Not learned